Add additional fedora variants

roles/netbootxyz/templates/menu/fedora.ipxe.j2

@@ -33,6 +33,7 @@ menu ${os} ${os_arch} sku type
 item Everything ${ova} Everything
 item Server ${ova} Server
 item Kinoite ${ova} Kinoite
+item Onyx ${ova} Onyx
 item Silverblue ${ova} Silverblue 
 item Sericea ${ova} Sericea
 isset ${sku_type} || choose sku_type || goto fedora